switch to golang wrapper for enet

backend/Dockerfile

@@ -1,14 +1,44 @@
-FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
-WORKDIR /build
-COPY Backend.csproj .
-RUN dotnet restore
-COPY . .
-RUN dotnet build -c Release
+# Build stage
+FROM golang:1.25-bookworm AS builder
 
-FROM mcr.microsoft.com/dotnet/runtime:10.0
 WORKDIR /app
-COPY --from=build /build/bin/Release/net10.0 .
-ENV ENET_HOST=0.0.0.0
-ENV ENET_PORT=7777
-EXPOSE 7777/udp
-ENTRYPOINT ["./Backend"]
+
+# Install dependencies including libenet-dev from Debian repos
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    gcc \
+    pkg-config \
+    libenet-dev \
+    sqlite3 \
+    libsqlite3-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy go mod and sum files
+COPY go.mod go.sum ./
+
+# Download dependencies
+RUN go mod download
+
+COPY ./*.go .
+
+# Enable CGO for go-sqlite3 and go-enet
+ENV CGO_ENABLED=1
+
+RUN go build -o main .
+
+# Runtime stage
+FROM debian:bookworm-slim
+
+WORKDIR /app
+
+# Install runtime dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libenet7 \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /app/main .
+
+EXPOSE 8095
+
+CMD ["./main"]